Tool-post



P. M. BEDARD.

TOOL POST.

APPLICATION FILED NOV. 29, I919.

Patented July 27, 1920.

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WITNESS:

ATTORNEY.

PATENT orrlcr.

PHILIAS M. BEDARD, or SPRINGFIELD, MASSACHUSETTS.

TOOL-POST.

Application filed November 29, 1919.

To all whom it may concern:

Be it known that I, PHILIAS M. BEDARD, a subject of the King of England, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented a new and useful T ool-Post, of which the following is a specification.

My invention relates to improvements in tool-posts which are supported on and carried by the slide-rests of lathes, and consists essentially of a bolt having a head of peculiar construction, and adjustable supporting members for the tool or tools, a spring-pressed tool-clamping member, and a nut all mounted on the shank of said bolt, together with any auxiliary and subsidiary parts and members, including supporting means or a supporting member for what may be termed the tool-post proper, that Y may be necessary or desirable in order to make the device complete or render it wholly efficient, all as hereinafter set forth.

The primary object of my invention is to produce a simple and inexpensive yet strong and durable tool-post, which is adapted to be attached to a supporting member having a T-slot of any reasonable size and width, and is capable of securely holding not alone one but two tool's, atany angle on a horizontal plane, with the proper amount of projection, which amount may and usually will be different as between two tools when that number is used in the tool-post, and at the required elevation.

By equipping the tool-post with two tools the efiiciency thereof is practically doubled in many cases, since I am able thereby to make two different cuts at one operation and without being required to reset the tools. The great advantage of this-is obvious to one skilled in the art.

In this tool-post a broad support is provided for the tool or tools, and the latter areheld so securely and firmly on such support that there is practically no liability of chattering on the part of said tool or tools. A finished product is thus insured.

As already intimated this tool-post has a wide range of application, and facilities for all needed adjustments.

Other objects and advantages will appear in the course of the following description.

I attain the objects and secure the advan- Specification of Letters Patent.

Patented July 27, 1920.

Serial No. 341,442.

tages of my invention by the means illustrated in the accompanying drawings, in which- I Figure 1 is a top plan of a tool-post which embodies a practical form ofmy invention, the same being equipped with two tools; Fig. 2, what may be termed a front elevaE tion of said tool-post; Fig. 3, a top plan of the bolt; Fig. 4:, atop plan of the under member of the adjustable, tool-supporting members, and, Fig. 5, what may be termed a side elevation of the tool-post.

Similar reference numerals designate similar parts throughout the several views. The carriage or slide-rest on a lathe ord narlly comprises base pieces and a crossp ece, and thereis a T-slot in said crosspiece for the tool-post commonly employed, and there are also T-slots in said base pieces for various attachments that may be used. My tool-post, like an ordinary tool-post, is attachable to the aforesaid cross-piece, and also to either base piece on either side of said cross-piece, but when said first-named tool-post is attached to one of the arms on either base piece a special support or base is employed in order to position the tool or tools in said tool-post at the required height, or on a level with such tool or tools in the event the tool-post were mounted on the cross-piece.

In Figs. 1, 2, and 5, I show at 1 the lefthand arm of what is assumed to be the back base piece of a slide-rest. This arm has the customary T-slot in the center of the top thereof, as represented at 2, and the usual V-slots in the arm, as shown at 3-3, in Fig. 5, to receive two of the thelathe.

A base or post 4 is mounted on the arm 1 and secured thereto by means of bolts 55 and nuts 6-6. The post l may be round and it has at the bottom oppositely-disposed, horizontal flanges 7-7 with slots 88 centrally located in their outer ends to receive the bolts 5. The heads of the bolts 5 are received in the T-slot 2, and washers 9-9 are introduced between the flanges 7 and the nuts 6. By means of the bolts 5 and nuts 6 the post or based can be readily secured to and released from the arm 1, and located thereon at any point within the limit fixed by the T-slot '2, as will be clearly guides on the bed of seen. The flanges 7 are over the T-slot 2 with the slots 8 directly above said T-slot. In the event the T-slot in the slide-rest arm extends transversely instead of longitudinally thereof, as is frequently the case, the base 4 can be secured to said arm by the same means and in the same manner as already described, provided said base with its flanges be not too long.

In the top of thebase 1 is a T-slot 10. This T-slot takes the place of the T-slot in the cross-piece of the slide-rest of which mention has been made, and is on the same level approximately with the T-slot in said cross-piece, so that the members mounted on r and attached to said base, and which will next be described, can be mounted on and attached to such cross-piece just as well as they can be mounted on and attached to said base.

The aforesaid members consist of a bolt 11 having a head 12 which is long and narrow and has oblique or angular ends, best shown in Fig. 3; upper and under, square,- supporting plates 13 and 14:, respectively, the contiguous faces of which are provided with teeth 15,'and each'of which has an elongated slot 16 in the center (see Fig. 4:) to receive said bolt; a clamping plate 1? mounted on said bolt above said plate 13 and separated from the latter by a spiral spring 18 which encircles the bolt; and a nut 19 on the upper terminal of the bolt, with a washer 20 interposed between said plate 17 and said nut. The plate 17 may be of the shape best shown in Fig. 1 or of any other suitable shape. The space for the tool 7 or tools is between the plates 13 and 17.

It is immaterial, so far as the present invention is concerned, whether the bare tool or a holder for such tool is clamped in place 7 in this tool-post, and, for the purpose of this specification, the cutting member is designated by the term tool whether or not the same consists of a single piece or be made up of several parts. Two tools are represented at 21. V

The head 12 of the bolt 11 is receivable in the T-slot provided for it, whether'such slot be large or small,wide or narrow, within the limits set by the head itself. If the T- slot be wide, the head 12 is placed crosswise or obliquely therein, while if said Tslot be narrow, as is the T-slot 10, said headis placed lengthwise therein,'the general proportions and the shape of the ends of the 'head being the factors responsible for this wide range of adaptability. So long as the portion of said T-slot of suflicient depth to receive the head 12, it does not matter how much larger and deeper such portions may.

be in excess of the diameter of said bolt and the thickness of said head. The head 12 is when the parts are clamped together.

held against the top of the horizontal por tion of the T-slot, as will presently be explained.

The under plate 14 rests on top of the base 1, the upper plate 13 on top of said plate 14, and the tools 21 on top of said plate 13. These supporting plates are made adjustable for the purpose of locating the tools 21 at exactly the required height or level. The teeth 15 hold the supporting plates firmly in place after adjustment and It will be observed that the surfacesof the supporting plates which are provided with theteeth 15 are inclined, the inclinations being in the same direction. Upon moving these plates, under the guidance of the bolt 11 in the slots 16, in a manner to cause the upper plate to assume a higher position on the under plate, the elevation of said upper plate is increased, and upon moving said plates in opposite directions relatively or so that said upper plate is caused to assume a lower position on the under plate, the elevation of said upper plate is decreased, the amount of elevation or depression, as the case may be, being commensurate with the amount of movement imparted to the plates. In order thus to move the plates 13 and 14 it is necessary, of course, first to raise the plate 13, against the force of the spring 18,

to an extent suflicient to disengage the teeth 15. After the required adjustment has been made the plate 13 is permitted to descend onto the plate 14: and the teeth 15. become rengaged for the purpose hereinbefore explained, r

The spring-18 has a constant tendency to retain the clamping plate 17 'up against the washer 20 so that the said plate is out of the way when the tools 21 are introduced beneath the same, provided the nut 19 r be turned'up high enough on the bolt 11, said plate always rising with said bolt when the latter is rotated in the direction to elevate it.

The plates 17, 13, and 14: are freely rotatable on the bolt 11, in the absence of any restraining force.

After the tools 21 are inserted between the plates 13 and 17 and properly positioned on said plate 13, the bolt 19 is screwed down until said plate 17 is forced tightly on to said tools, when the latter are held securely between said plates. Before tightening the parts, the plates 13 and 1e are adjusted to present example it is assumed that the tool'- post is carried to the left in making the active stroke with the tools 21, and that the forward cutting ends of said tools are the ones in use, having special reference to Fig. 1. And the left-hand tool is set so that its forward cutting end does not project as far as the corresponding end of the right hand tool, with the result that the tools make two outs of different depths.

The parts can readily be adjusted so as to position the tools in any required direction or directions on a horizontal plane, and with various-amounts of projection relative and otherwise.

When it is desired to remove the tools it is simply necessary to loosen the nut 19 and withdraw said tools from the tool-post.

Although this toolpost is essentially adapted for two tools a single tool may be used therewith.

More or less change in the size, shape, construction. and arrangement of some or all of the parts of this tool-post may be made without departing from the spirit of my invention or exceeding the scope of what is claimed.

hat I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in a tool-post, with a slotted support, of a bolt having a head which is receivable in the slot in said support, said head being longer in one direction than in the other and having oblique ends, and tool-supporting and clamping means on said bolt.

2. The combination, in a tool-post, with a slotted support, of a bolt having a head which is receivable in the slot in said support, slotted tool-supporting members on said bolt, the contiguous faces of said members being inclined and provided with Itoeeth, and tool-clamping means also on said olt.

8. The combination, in a tool-post, with a slotted support, of a bolt having a head which is receivable in the slot in said support, and adjustable tool-supporting members, a spring-pressed tool-clamping member, and a nut on said bolt.

4. The combination, in a tool-post, With a slotted support, of a bolt having a head which is receivable in the slot in said support, tool-supporting members on said bolt, said members being adjustable to raise or lower the tool-supporting surface thereof, and a tool-clamping plate and nut also on said bolt, said tool-supporting surface and the tool-contacting surface of said plate being plain surfaces, and of sufficient area operatively to engage a plurality of tools and hold the same at any angle.

PHILIAS M. BEDARD.

Witnesses:

PETER H. RooILLARD, F. A. CUTTER. 

